/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
 */
package javax.swing.plaf.basic;

import javax.swing.*;
import java.awt.Component;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.event.InputEvent;

import sun.swing.SwingUtilities2;


/*
 * @author Hans Muller
 */

public class BasicGraphicsUtils {

    private static final Insets GROOVE_INSETS = new Insets(2, 2, 2, 2);
    private static final Insets ETCHED_INSETS = new Insets(2, 2, 2, 2);

    public static void drawEtchedRect(Graphics g, int x, int y, int w, int h,
                                      Color shadow, Color darkShadow,
                                      Color highlight, Color lightHighlight) {
        Color oldColor = g.getColor();  // Make no net change to g
        g.translate(x, y);

        g.setColor(shadow);
        g.drawLine(0, 0, w - 1, 0);      // outer border, top
        g.drawLine(0, 1, 0, h - 2);      // outer border, left

        g.setColor(darkShadow);
        g.drawLine(1, 1, w - 3, 1);      // inner border, top
        g.drawLine(1, 2, 1, h - 3);      // inner border, left

        g.setColor(lightHighlight);
        g.drawLine(w - 1, 0, w - 1, h - 1);  // outer border, bottom
        g.drawLine(0, h - 1, w - 1, h - 1);  // outer border, right

        g.setColor(highlight);
        g.drawLine(w - 2, 1, w - 2, h - 3);  // inner border, right
        g.drawLine(1, h - 2, w - 2, h - 2);  // inner border, bottom

        g.translate(-x, -y);
        g.setColor(oldColor);
    }


    /**
     * Returns the amount of space taken up by a border drawn by
     * <code>drawEtchedRect()</code>
     *
     * @return the inset of an etched rect
     */
    public static Insets getEtchedInsets() {
        return ETCHED_INSETS;
    }


    public static void drawGroove(Graphics g, int x, int y, int w, int h,
                                  Color shadow, Color highlight) {
        Color oldColor = g.getColor();  // Make no net change to g
        g.translate(x, y);

        g.setColor(shadow);
        g.drawRect(0, 0, w - 2, h - 2);

        g.setColor(highlight);
        g.drawLine(1, h - 3, 1, 1);
        g.drawLine(1, 1, w - 3, 1);

        g.drawLine(0, h - 1, w - 1, h - 1);
        g.drawLine(w - 1, h - 1, w - 1, 0);

        g.translate(-x, -y);
        g.setColor(oldColor);
    }

    /**
     * Returns the amount of space taken up by a border drawn by
     * <code>drawGroove()</code>
     *
     * @return the inset of a groove border
     */
    public static Insets getGrooveInsets() {
        return GROOVE_INSETS;
    }


    public static void drawBezel(Graphics g, int x, int y, int w, int h,
                                 boolean isPressed, boolean isDefault,
                                 Color shadow, Color darkShadow,
                                 Color highlight, Color lightHighlight) {
        Color oldColor = g.getColor();  // Make no net change to g
        g.translate(x, y);

        if (isPressed && isDefault) {
            g.setColor(darkShadow);
            g.drawRect(0, 0, w - 1, h - 1);
            g.setColor(shadow);
            g.drawRect(1, 1, w - 3, h - 3);
        } else if (isPressed) {
            drawLoweredBezel(g, x, y, w, h,
                    shadow, darkShadow, highlight, lightHighlight);
        } else if (isDefault) {
            g.setColor(darkShadow);
            g.drawRect(0, 0, w - 1, h - 1);

            g.setColor(lightHighlight);
            g.drawLine(1, 1, 1, h - 3);
            g.drawLine(2, 1, w - 3, 1);

            g.setColor(highlight);
            g.drawLine(2, 2, 2, h - 4);
            g.drawLine(3, 2, w - 4, 2);

            g.setColor(shadow);
            g.drawLine(2, h - 3, w - 3, h - 3);
            g.drawLine(w - 3, 2, w - 3, h - 4);

            g.setColor(darkShadow);
            g.drawLine(1, h - 2, w - 2, h - 2);
            g.drawLine(w - 2, h - 2, w - 2, 1);
        } else {
            g.setColor(lightHighlight);
            g.drawLine(0, 0, 0, h - 1);
            g.drawLine(1, 0, w - 2, 0);

            g.setColor(highlight);
            g.drawLine(1, 1, 1, h - 3);
            g.drawLine(2, 1, w - 3, 1);

            g.setColor(shadow);
            g.drawLine(1, h - 2, w - 2, h - 2);
            g.drawLine(w - 2, 1, w - 2, h - 3);

            g.setColor(darkShadow);
            g.drawLine(0, h - 1, w - 1, h - 1);
            g.drawLine(w - 1, h - 1, w - 1, 0);
        }
        g.translate(-x, -y);
        g.setColor(oldColor);
    }

    public static void drawLoweredBezel(Graphics g, int x, int y, int w, int h,
                                        Color shadow, Color darkShadow,
                                        Color highlight, Color lightHighlight) {
        g.setColor(darkShadow);
        g.drawLine(0, 0, 0, h - 1);
        g.drawLine(1, 0, w - 2, 0);

        g.setColor(shadow);
        g.drawLine(1, 1, 1, h - 2);
        g.drawLine(1, 1, w - 3, 1);

        g.setColor(lightHighlight);
        g.drawLine(0, h - 1, w - 1, h - 1);
        g.drawLine(w - 1, h - 1, w - 1, 0);

        g.setColor(highlight);
        g.drawLine(1, h - 2, w - 2, h - 2);
        g.drawLine(w - 2, h - 2, w - 2, 1);
    }


    /**
     * Draw a string with the graphics <code>g</code> at location (x,y)
     * just like <code>g.drawString</code> would.
     * The first occurrence of <code>underlineChar</code>
     * in text will be underlined. The matching algorithm is
     * not case sensitive.
     */
    public static void drawString(Graphics g, String text, int underlinedChar, int x, int y) {
        int index = -1;

        if (underlinedChar != '\0') {
            char uc = Character.toUpperCase((char) underlinedChar);
            char lc = Character.toLowerCase((char) underlinedChar);
            int uci = text.indexOf(uc);
            int lci = text.indexOf(lc);

            if (uci == -1) {
                index = lci;
            } else if (lci == -1) {
                index = uci;
            } else {
                index = (lci < uci) ? lci : uci;
            }
        }
        drawStringUnderlineCharAt(g, text, index, x, y);
    }

    /**
     * Draw a string with the graphics <code>g</code> at location
     * (<code>x</code>, <code>y</code>)
     * just like <code>g.drawString</code> would.
     * The character at index <code>underlinedIndex</code>
     * in text will be underlined. If <code>index</code> is beyond the
     * bounds of <code>text</code> (including &lt; 0), nothing will be
     * underlined.
     *
     * @param g               Graphics to draw with
     * @param text            String to draw
     * @param underlinedIndex Index of character in text to underline
     * @param x               x coordinate to draw at
     * @param y               y coordinate to draw at
     * @since 1.4
     */
    public static void drawStringUnderlineCharAt(Graphics g, String text,
                                                 int underlinedIndex, int x, int y) {
        SwingUtilities2.drawStringUnderlineCharAt(null, g, text,
                underlinedIndex, x, y);
    }

    public static void drawDashedRect(Graphics g, int x, int y, int width, int height) {
        int vx, vy;

        // draw upper and lower horizontal dashes
        for (vx = x; vx < (x + width); vx += 2) {
            g.fillRect(vx, y, 1, 1);
            g.fillRect(vx, y + height - 1, 1, 1);
        }

        // draw left and right vertical dashes
        for (vy = y; vy < (y + height); vy += 2) {
            g.fillRect(x, vy, 1, 1);
            g.fillRect(x + width - 1, vy, 1, 1);
        }
    }

    public static Dimension getPreferredButtonSize(AbstractButton b, int textIconGap) {
        if (b.getComponentCount() > 0) {
            return null;
        }

        Icon icon = b.getIcon();
        String text = b.getText();

        Font font = b.getFont();
        FontMetrics fm = b.getFontMetrics(font);

        Rectangle iconR = new Rectangle();
        Rectangle textR = new Rectangle();
        Rectangle viewR = new Rectangle(Short.MAX_VALUE, Short.MAX_VALUE);

        SwingUtilities.layoutCompoundLabel(
                b, fm, text, icon,
                b.getVerticalAlignment(), b.getHorizontalAlignment(),
                b.getVerticalTextPosition(), b.getHorizontalTextPosition(),
                viewR, iconR, textR, (text == null ? 0 : textIconGap)
        );

        /* The preferred size of the button is the size of
         * the text and icon rectangles plus the buttons insets.
         */

        Rectangle r = iconR.union(textR);

        Insets insets = b.getInsets();
        r.width += insets.left + insets.right;
        r.height += insets.top + insets.bottom;

        return r.getSize();
    }

    /*
     * Convenience function for determining ComponentOrientation.  Helps us
     * avoid having Munge directives throughout the code.
     */
    static boolean isLeftToRight(Component c) {
        return c.getComponentOrientation().isLeftToRight();
    }

    static boolean isMenuShortcutKeyDown(InputEvent event) {
        return (event.getModifiers() &
                Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()) != 0;
    }
}
